LXR linux/drivers/gpu/drm/nouveau/core/subdev/therm/fantog.c

   1/*
   2 * Copyright 2012 The Nouveau community
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Martin Peres
  23 */
  24
  25#include "priv.h"
  26
  27#include <core/object.h>
  28#include <core/device.h>
  29
  30#include <subdev/gpio.h>
  31#include <subdev/timer.h>
  32
  33struct nouveau_fantog_priv {
  34        struct nouveau_fan base;
  35        struct nouveau_alarm alarm;
  36        spinlock_t lock;
  37        u32 period_us;
  38        u32 percent;
  39        struct dcb_gpio_func func;
  40};
  41
  42static void
  43nouveau_fantog_update(struct nouveau_fantog_priv *priv, int percent)
  44{
  45        struct nouveau_therm_priv *tpriv = (void *)priv->base.parent;
  46        struct nouveau_timer *ptimer = nouveau_timer(tpriv);
  47        struct nouveau_gpio *gpio = nouveau_gpio(tpriv);
  48        unsigned long flags;
  49        int duty;
  50
  51        spin_lock_irqsave(&priv->lock, flags);
  52        if (percent < 0)
  53                percent = priv->percent;
  54        priv->percent = percent;
  55
  56        duty = !gpio->get(gpio, 0, DCB_GPIO_FAN, 0xff);
  57        gpio->set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
  58
  59        if (list_empty(&priv->alarm.head) && percent != (duty * 100)) {
  60                u64 next_change = (percent * priv->period_us) / 100;
  61                if (!duty)
  62                        next_change = priv->period_us - next_change;
  63                ptimer->alarm(ptimer, next_change * 1000, &priv->alarm);
  64        }
  65        spin_unlock_irqrestore(&priv->lock, flags);
  66}
  67
  68static void
  69nouveau_fantog_alarm(struct nouveau_alarm *alarm)
  70{
  71        struct nouveau_fantog_priv *priv =
  72               container_of(alarm, struct nouveau_fantog_priv, alarm);
  73        nouveau_fantog_update(priv, -1);
  74}
  75
  76static int
  77nouveau_fantog_get(struct nouveau_therm *therm)
  78{
  79        struct nouveau_therm_priv *tpriv = (void *)therm;
  80        struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
  81        return priv->percent;
  82}
  83
  84static int
  85nouveau_fantog_set(struct nouveau_therm *therm, int percent)
  86{
  87        struct nouveau_therm_priv *tpriv = (void *)therm;
  88        struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
  89        if (therm->pwm_ctrl)
  90                therm->pwm_ctrl(therm, priv->func.line, false);
  91        nouveau_fantog_update(priv, percent);
  92        return 0;
  93}
  94
  95int
  96nouveau_fantog_create(struct nouveau_therm *therm, struct dcb_gpio_func *func)
  97{
  98        struct nouveau_therm_priv *tpriv = (void *)therm;
  99        struct nouveau_fantog_priv *priv;
 100
 101        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 102        tpriv->fan = &priv->base;
 103        if (!priv)
 104                return -ENOMEM;
 105
 106        priv->base.type = "toggle";
 107        priv->base.get = nouveau_fantog_get;
 108        priv->base.set = nouveau_fantog_set;
 109        nouveau_alarm_init(&priv->alarm, nouveau_fantog_alarm);
 110        priv->period_us = 100000; /* 10Hz */
 111        priv->percent = 100;
 112        priv->func = *func;
 113        spin_lock_init(&priv->lock);
 114        return 0;
 115}
 116